Being together is about being there for each other. There are times in life when your loved one goes through an emotional phase.
At this time they will need you even more and your presence can make an even bigger difference to make them overcome that phase. The difficult time do pass, but If they feel ignored during this time, they get emotionally disconnected and slowly it creates a distance between the two. Emotional needs often get unnoticed but are much needed to feel the closeness in a relationship.
Value your partner's emotions and understand their emotional needs might be different from yours. Always be present for them but the times when they need you more, be even closer to them.